<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>083-布局-下边距测试.html</title>
	<style>
		*{
			margin: 0;
			padding: 0;
		}
		.box{
			border: 1px solid #000;
			margin-bottom: 20px;
		}
		.box1{
			border: 1px solid #000;
		}
	</style>
</head>
<body>
	<div class="box">
		<p>1</p>
		<p>2</p>
		<p>3</p>
	</div>
	<div class="box1">
		<p>1</p>
		<p>2</p>
		<p>3</p>
	</div>
</body>
</html>